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Comparison of Uniform Four-foot Length, Fully Grouted Resin Roof Bolts and Alternating Four- and Six-foot Length, Fully Grouted Resin Roof Bolts.

Maher J
NTIS: PB/263-590 Available for Reference At Bureau Libraries :316 pages
This contract work is the second phase of a project to obtain a comparison of resin and mechanical roof bolting. Phase one resulted in performance characterization of the two bolt types under production conditions. This phase compared the behavior of two resin systems in high horizontally stressed ground by measurement of bolt loads and roof movement underground in rock of the two systems. Data generated under this project show that there was no discernible difference in the roof support given by uniform four- foot and by alternating four- and six-foot resin bolts in two different ground conditions. It was concluded that in mine roof support, the particular roof bolt system used is often important but it is usually not of controlling importance, rather the dominant factors include the structural geology, the in situ stresses, and the interaction of the mine design with these. This contract provided insight on the mechanisms of roof support and its control by rock bolting.
Publication Date
Document Type
CP; Final Contract Report;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
OFR 23-77
NIOSH Division
Source Name
NTIS: PB/263-590 Available for Reference At Bureau Libraries
Performing Organization
White Pine Copper Company
Page last reviewed: October 15, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division